Dynamics of a colloidal glass during stress-mediated structural arrest

We employ parallel superposition rheology to study the dynamics of an aging colloidal glass in the presence of a mean field stress. Over a range of intermediate stresses, the loss modulus exceeds the storage modulus at short times but develops a maximum concomitant with a crossover between the two as the system ages. This is attended by a narrowing of the loss peak on increasing stress. We show that this feature is characteristic of the structural arrest in these materials, which is made observable on reasonable timescales by the activating influence of the stress. The arrest time displays an exponential dependence on inverse stress. These results provide experimental validation of the role of stress as an effective temperature in soft glassy systems as has been advanced in recent theoretical frameworks.Comment: 5 pages, 5 figure

Impact of quality and reliability of irrigation on field and farm level water productivity of crops

Water ProductivityCrop productionCerealsFodderIrrigation waterWater qualityIrrigation canalsWellsConjunctive useSoil moisture

Coupling nanomechanical cantilevers to dipolar molecules

We investigate the coupling of a nanomechanical oscillator in the quantum regime with molecular (electric) dipoles. We find theoretically that the cantilever can produce single-mode squeezing of the center-of-mass motion of an isolated trapped molecule and two-mode squeezing of the phonons of an array of molecules. This work opens up the possibility of manipulating dipolar crystals, which have been recently proposed as quantum memory, and more generally, is indicative of the promise of nanoscale cantilevers for the quantum detection and control of atomic and molecular systems.Comment: 3 figures, 4page

Non-steroidal anti-inflammatory drugs—changes in prescribing may be warranted

No abstract available

#MeToo as Catalyst: A Glimpse into 21st Century Activism

The Twitter hashtag #MeToo has provided an accessible medium for users to share their personal experiences and make public the prevalence of sexual harassment, assault, and violence against women. This online phenomenon, which has largely involved posting on Twitter and “retweeting” to share other’s posts has revealed crucial information about the scope and nature of sexual harassment and misconduct. More specifically, social media has served as a central forum for this unprecedented global conversation, where previously silenced voices have been amplified, supporters around the world have been united, and resistance has gained steam. This Essay discusses the #MeToo movement within the broader context of social media activism, explaining how this unique form of collective action is rapidly evolving. We offer empirical insights into the types of conversations taking place under the hashtag and the extent to which the movement is leading to broader social change. While it is unclear which changes are sustainable over time, it is clear that the hashtag #MeToo has converted an online phenomenon into tangible change, sparking legal, political, and social changes in the short run. This Essay provides data to illustrate some of these changes, which demonstrate how posting online can serve as an impetus, momentum, and legitimacy for broader movement activity and changes offline more characteristic of traditional movement strategies

Risk of acute myocardial infarction with nonselective non-steroidal anti-inflammatory drugs: a meta-analysis

The use of cyclo-oxygenase 2 selective nonsteroidal anti-inflammatory drugs (NSAIDs) is associated with increased risk of acute myocardial infarction (AMI). The association between the risks of AMI with nonselective NSAIDs is less clear. We reviewed the published evidence and assessed the risk of AMI with nonselective NSAIDs. We performed a meta-analysis of all studies containing data from population databases that compared the risk of AMI in NSAID users with that in non-users or remote NSAID users. The primary outcome was objectively confirmed AMI. Fourteen studies met predefined criteria for inclusion in the meta-analysis. Nonselective NSAIDs as a class was associated with increased AMI risk (relative AMI risk 1.19, 95% confidence interval [CI] 1.08 to 1.31). Similar findings were found with diclofenac (relative AMI risk 1.38, 95% CI 1.22–1.57) and ibuprofen (relative AMI risk 1.11, 95% CI 1.06 to 1.17). However, this effect was not observed with naproxen (relative AMI risk 0.99, 95% CI 0.88–1.11). In conclusion, based on current evidence, there is a general direction of effect, which suggests that at least some nonselective NSAIDs increase AMI risk. Analysis based on the limited data available for individual NSAIDs, including diclofenac and ibuprofen, supported this finding; however, this was not the case for naproxen. Nonselective NSAIDs are frequently prescribed, and so further investigation into the risk of AMI is warranted because the potential for harm can be substantial